Mazda May Quit Michigan Venture

TOKYO—Ford Motor Co. and Mazda Motor Corp. are discussing breaking up their 50-50 joint-production venture in the U.S., a person familiar with the matter said Friday.

The talks are the latest sign that the Japanese and U.S. auto makers are going their separate ways after decades of close ties. While Mazda's Chief Executive Takashi Yamanouchi has repeatedly said that Ford remains a strategic partner, the two companies have grown apart...